Techniques to avoid atrioventricular block during radiofrequency catheter ablation of septal tachycardia substrates in young patients.

Radiofrequency catheter ablation (RFCA) has proven safe for most young patients, but the risk of inadvertent atrioventricular (AV) block remains. The purpose of this report is to describe techniques to avoid inadvertent AV block during effective RFCA in young patients with septal tachycardia substrates.